Ignore NaN when checking data range in ImageView.

Merge remote-tracking branch 'zarch/bottleneck_range' into develop

CHANGELOG

@@ -66,6 +66,7 @@ pyqtgraph-0.9.9  [unreleased]
     - Fixed unicode support in Dock
     - Fixed PySide crash caused by emitting signal from GraphicsObject.itemChange
     - Fixed possible infinite loop from FiniteCache
+    - Allow images with NaN in ImageView
 
 pyqtgraph-0.9.8  2013-11-24
 

README.md

@@ -28,6 +28,7 @@ Contributors
   * Thomas S.
   * Fabio Zadrozny
   * Mikhail Terekhov
+  * Pietro Zambelli
 
 Requirements
 ------------

pyqtgraph/imageview/ImageView.py

@@ -33,6 +33,11 @@ from .. import debug as debug
 
 from ..SignalProxy import SignalProxy
 
+try:
+    from bottleneck import nanmin, nanmax
+except ImportError:
+    from numpy import nanmin, nanmax
+
 #try:
     #from .. import metaarray as metaarray
     #HAVE_METAARRAY = True
@@ -526,7 +531,7 @@ class ImageView(QtGui.QWidget):
             sl = [slice(None)] * data.ndim
             sl[ax] = slice(None, None, 2)
             data = data[sl]
-        return data.min(), data.max()
+        return nanmin(data), nanmax(data)
 
     def normalize(self, image):
         """

pyqtgraph/imageview/tests/test_imageview.py

+import pyqtgraph as pg
+import numpy as np
+
+app = pg.mkQApp()
+
+def test_nan_image():
+    img = np.ones((10,10))
+    img[0,0] = np.nan
+    v = pg.image(img)
+    app.processEvents()
+    v.window().close()